openssl_pbkdf2

    (PHP 5 >= 5.5.0, PHP 7, PHP 8)

    openssl_pbkdf2 — Generates a PKCS5 v2 PBKDF2 string

    Опис

    openssl_pbkdf2(
        #[\SensitiveParameter] string $password,
        string $salt,
        int $key_length,
        int $iterations,
        string $digest_algo = "sha1"
    ): string|false

    openssl_pbkdf2() computes PBKDF2 (Password-Based Key Derivation Function 2), a key derivation function defined in PKCS5 v2.

    Параметри

    password

    Password from which the derived key is generated.

    salt

    PBKDF2 recommends a crytographic salt of at least 128 bits (16 bytes).

    key_length

    Length of desired output key.

    iterations

    The number of iterations desired. » NIST recommends at least 1,000. As of 2023, OWASP recommends 600,000 iterations for PBKDF2-HMAC-SHA256 and 210,000 for PBKDF2-HMAC-SHA512.

    digest_algo

    Optional hash or digest algorithm from openssl_get_md_methods(). Defaults to SHA-1. It is recommended to set it to SHA-256 or SHA-512.

    Значення, що повертаються

    Returns raw binary string або false в разі помилки.

    Приклади

    Приклад #1 openssl_pbkdf2() example

    <?php
    $password     = 'password';
    $salt = openssl_random_pseudo_bytes(16);
    $keyLength = 20;
    $iterations = 600000;
    $generated_key = openssl_pbkdf2($password, $salt, $keyLength, $iterations, 'sha256');
    echo     bin2hex($generated_key)."\n";
    echo     base64_encode($generated_key)."\n";
    ?>

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    User Contributed Notes 1 note

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    0
    McGlockenshire
    10 years ago
    Despite the manual claiming that this is available in PHP 5.5 and above, this function wasn't made available in my local install.

    I expect that having a prehistoric OpenSSL library version installed is the likely culprit.

    If you're using PHP 5.5 and don't have this function available in your OpenSSL extension, look at the functionally equivalent hash_pbkdf2 function instead.
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